<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            background-image: url();
        }
        .box{
            width: 200px;
            height: 200px;
            
            margin: 150px 600px;
            animation: big 1s infinite alternate;
        }
        .left{
            width: 100px;
            height: 160px;
            border-radius: 50px 50px 0px 0px;
            background-color: #eb1414;
            transform: rotate(-45deg);
        }
        .right{
            position: absolute;
            top: 0px;
            left:43px;
            width: 100px;
            height: 160px;
            border-radius: 50px 50px 0px 0px;
            background-color: #eb1414;
            transform: rotate(45deg);
        }
        @keyframes big{
            100%{
                transform: scale(1.5);
            }
        }
        
    </style>
</head>
<body>
    <div class="box">
        <div class="left"></div>
        <div class="right"></div>
    </div>
   
</body>
</html>